slackware: add short sleep to initscript during service restart

The restart() function almost never works here - perhaps some part
of NM takes a bit too long to stop() and then blocks the start()
operation - but "sleep 2" between them makes everything fine.

initscript/Slackware/rc.networkmanager.in

@@ -62,6 +62,7 @@ nm_stop()
 nm_restart()
 {
   nm_stop
+  sleep 2
   nm_start
 }